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Manifold Dust Cap leaks when zones run?

Hello everyone,

I have just purchased a house and am trying to do some maintenance on the sprinkler system. Prior to this I have no experience with sprinklers. Ive been researching and reading up on things, everything makes sense and I am fixing issues one at a time.

I have 4 zones, when I run the system 2 of the zone's dust caps (i think thats what the yare called)... its this piece here -->